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Tool

Google Earth

http://earth.google.com/ (more info)

Google Earth is an online mapping and visualization software that enables users to combine geographic information with satellite imagery. It allows layering of images and provides the means to determine relationships between "stacked" visualizations. It reads formatted KML files. This tool provides users with a way of manipulating Earth views through rotating, tilting, and zooming in and out.

Tool Builder

Google—Headquartered in Mountain View, CA.
Google Earth is based on technology from Keyhole, a company which Google acquired in 2004.

Tool Cost

Google Earth is a free download offered by Google. Other, more powerful versions are available for purchase.

Tool Help

User guide: http://earth.google.com/userguide/v5/
Support: http://earth.google.com/support/?hl=en  

Data Source 1

NASA Aura NO₂ Tropospheric Vertical Column Density Data

Aura is an Earth Observing System (EOS) satellite designed to collect data about the composition and chemistry of Earth's atmosphere. The satellite has four onboard instruments: these are the High Resolution Dynamics Limb Sounder, Microwave Limb Sounder, Ozone Monitoring Instrument, and Tropospheric Emission Spectrometer. Nitrogen Dioxide (NO₂) data is available in KML format through NASA.

For more information on this data set see Exploring changes in air quality using Aura tropospheric NO2 data

Data Source 2

Gridded Population of the World

High-resolution world population density data originated by the Center for International Earth Science Information Network (CIESIN) of the Earth Institute at Columbia University. A KML file version can be obtained through Google Earth Community.